Machine for forming loops on the ends of the wires of wire-bound boxes



July 20, 1943. w. FLNEwHousE ETAL 2,324,530

MACHINE FOR FORMING LOOPS ON THE ENDS OF THE WIRES OF WIREBOUND BOXES Filed Aug. 3, 1940 16 Sheets-Sheet l E5 1 lillllllllll rfjlwkawe w. Leslie MflLZZ w; F. NEWHOUSE ETAL 2,324,530

July 20, 1943.

MACHINE FOR FORMING LOOPS ON THE ENDS OF HIE WIRES OF WIREBOUND BOXES l6 Sheets-Sheet 2 Filed Aug; 3, 1940 ZHZZIKS'L /Vewkawse July 20, 1943.

FIG: 3.

W. F. NEWHOUSE ETAL MACHINE FOR FORMING LOOPS ON THE ENDS OF THE WIRES 0F WIREBOUND BOXES Filed Aug. 3, 1940 -16 Sheets-Sheet 3 July 20, 1943. g w. F. NEWHOUSE 11m. 3

. MACHINE FOR FORMING LOOPS ON THE ENDS OF THE WIRES OF WIREBOUND BOXES Filed Aug. 3, 1940 16 Sheets-Sheet 4 /Gf6. I \50 July 20, 1943. .w. F. NEWHOUSE ETAL. 2,324,530

MACHINE FOR FORMING LOOPS ON THE ENDS OF THE WIRES 0F WIREBOUND BOXES 7 Filed Aug. 3, 1940 16 Sheets SheM; 5

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MAGHI FOR FOR s on THE ENDS OF v E WIRES OF WIREBOUND BOXES Y Filed Aug. 3, 1940 l6 Sheets-Sheet 6 45 74 water w/ww ZIe:sZ'e./V. jLZZ y 1943. w. F. NEWHOUSE E TAL 2,324,530

MACHINE FOR FORMING LOOPS ON THE ENDS OF THE WIRES 0F WIREBOUND BOXES Filed Aug. 16 Sheets -Sheet 'r y 1943. w. F. NEWHOUSE ET AL- 2,324,530

MACHINE FOR FORMING LOOPS ON THE ENDS OF THE WIRES OF WIREBOUND BOXES Filed Aug. 3, 1940 16 Sheets-Sheet 9 J 9 100 21 {753,156 1 F0, J55 l' i i J00 a 103 v I J3 3- uaa' W V J04 J07 J57 F. [NEW HOUSE ET AL R FORMING LOOPS ON THE ENDS OF WIREBOUND BOXES d Aug. 3, 1940 16 Sheets-Sheet ll July 20, 1943.

July 20, 1943. w. F. NEWHOUSE ET AL 2,324,530

' MACHINE FOR FORMING LOOPS ON THE ENDS OF THE WIRES 0F WIREBOUND BOXES Filed Aug. 3, 1940 16 Sheets-Sheet l2 July 20, 1943. w. F. NEWHOUSE ETAL v MACHINE FOR FORMING LOOPS ON THE ENDS OI" THE WIRES OF WIRgBOiIgZQBOXES 'Fileq Aug. 16 sneets-snee is July 20, 1943. F. NEwHbusE "E1; AL.

MACHINE R mum LOOPS o H N S OF,

THE w s OF w BOUND BO Filed Aug. ,1940 4 16 Sheets-Sheet 14 7/ FIG .45 I

fiuen zar'd' il/alarfll ewlwwe lesLzJeMJ/zle F. NEWHOUSE ETAL 2,324,530 R FORMING LOOP July 20, 1943. w,

MACHINE F0 s on THE ENDS OF THE WIRES 0F WIREBOUND BOXES Filed Aug. 3, 1940 1e Sheets-Sheot 15 Le. L e

N; is kS kUtte m; ii k i vmwkkhskh 'July 20, 1943. w. F. NEWHOU SE ETAL 2,

MACHINE FOR FORMING LOOPS ON THE ENDS OF I l'HE WIRES 0F WIREBOUND BOXES Filed Aug. 3, 1940 16 .Sheets-Sheet 16 a) r my J walzzz'ifA ezlziwe Patented July 20, 1943 MACIiINE FOR FORMING LOOPS ON THE ENDS OF THE WIRES OF WIRE-BOUND BOXES Walter F. Newhouse and Leslie M. Hile, Benton Harbor, Mich., assignors to Saranac Patents Holding Company, Benton Harbor, Mich, a corporation of Michigan Application August 3, 1940,, Serial No. 350,970

41 Claims.

This invention relates to machinery for forming loops on the ends of the binding wires of wireb'ound box or crate blanks. s r

Generally stated, the object oi the invention is to provide a novel and improved construction and, arrangement whereby a machine for this purpose is adapted to receive the box or crate blank, in any suitable. or desired manner, as by placing. the blank in the machine by hand, and is equipped with devices for then trimming the wire ends tothe desired length, and thereafter bending and twisting the wire and thereby form ing a loop on each end of each binding wire of the blank, so that one twisted loop at one end of the wire may be inter-engaged with the twisted loop at the other end of the same wire, when the finished box or crate is filled, thereby to hold the box or crate cover closed in such a manner that it can be opened by bending the wire and disengaging one loop .from the other, should this be necessary or desirable, as for the purpose of inspection of the contents of the box or crate dur ing the transportation thereof, as well as to make it easy and convenient to open the box or crate when it is finally desired to remove the contents thereof. Y c

Another object is to provide an improved construction and arrangement whereby a machine of this kind is operated more or less hydraulically in a manner to insure against breakage of parts of the machine, in case some part of'the blank or anything else should become jammed in any of the movable parts'of the machine, and to insure otheradvantages as Well. i

It is also an object to provide certain details and features of construction and combinations tending to increase the general efiiciency and desirability of a machine of this particular character. To the foregoing and other useful ends, the invention consists in matters hereinafter set forth and claimed and shown in the accompanying drawings, in Which Fig.1 is a front elevational view of a hydraulic F-lg. 4 is a fragmentary view of the machine showing the wiretrixnmer cylinder in cross section. s s

Fig. 5 is a sectional view of thetrimmer hy- Fig. 10 is a perspective view of theformer block used for making a long loop.

Fig. 11 is a fragmentary detailed view of a portion of the trimming and twisting mechanism. 1

Fig. 12 is a view similar to Fig. 11, showing the operating parts in changed position.

Fig. 13 is a plan view of a portion of the trimming and twisting mechanism.

Fig. 14 is a sectional view through the former hydraulic cylinder.

Fig. 15 is a sectional view of the former hyw draul'ic cylinder shown in Fig. 14, with the piston in a forward position. c c

Fig. 16 is a section taken on the line l6-l6 of Fig. 14. l

Fig. 17 is a sectional view taken on the line lL-I'l of Fig. 3, showing the twister hydraulic cylinder. cs c Fig. 18 is a view similar to Fig. 17, showinga changed position of the piston.

Fig. 19 is a section taken on the line I9I9 of Fig. 17. i l

' Fig. 20 is across sectional view taken on the line 20-20 of Fig. 3, showing a gripper mechanism.

Fig, 21 is a view Fig. 3. i s i c Fig. .22 is a sectional view taken on theline 22-42 of Fig. 20. s

Fig. 23 is a fragmentary perspective view showing the gripper holder slide and the clamping plates. i

Fig. 24 is a view similar to Fig. 20, showing the gripper mechanism in a different position.

Fig. 25 is a cross sectional view of the gripper mechanism taken on the line 25--25 of Fig. 24.

Figs. 26 and 27 are vertical cross sectional views taken through the gripper hydraulic cylinder.

8 Figs 28 and 29 are vertical cross sectional views taken through the stripper hydraulic cylinder. s s i V i Fig. 30 is a fragmentary perspective view showing'the purpose of the wire guide plate.

taken on the. line 2l2l of I Figs- 31, 32 and 33 are a series of views showpising the different steps in the twisting and stripping of the wire.

Fig. 34 is a sectional View taken on the line 34-34 of Fig. 32.

Fig. 35 is. a fragmentary view of the box blank with the completely twisted loop.

Figs. 35 and 37 are views of the wire twisting device for twisting a short loop.

Fig. 38 is a sectional View taken on the 3838 of Fig. 36.

Fig. 39 is a fragmentary view of the wire twisting device.

Fig. 4.0 is a fragmentary view of the box blank with the completed short loop.

Fig. 41 is a view of the lower portion of a wire stripping bar used for making the short loop.

Fig. 42 is a longitudinal sectional View of one of the hydraulic control valves and its connection with a reset valve used in the hydraulic control system.

Fig. 43 is a longitudinal sectional view of a hydraulic reset valve.

Fig. 44 is a longitudinal sectional view of a starting valve.

Fig. 45 is a diagrammatic view of the hydraulic system, the oil conduits being shown in single lines.

Fig. 46 is a perspective view of the box blank with the wires extending prior to being twisted.

Fig. 47 is a view of the box formed from the box blank.

Fig. 48 is a fragmentary perspective view showing a short twisted loop in association with a long twisted loop.

Fig. 49 is a diagram of an electrical wiring system as used for the dual control of the machine.

As thus shown, referring to Fig. l of the drawings, the machine comprises a left-hand unit I', and a right-hand unit 2, the left-hand unit being permanently fixed to the base 3, while 'the'righthand unit 2 is adapted to move longitudinally by means of a set of rollers'4, which engage a track 5 formed on the base support 3. An electric motor 6 is adapted'to drive an elongated screw 1 which engages a nut 8 (see Fig. 2) attached to the bottom portion of the right-hand unit 2. Turning of the screw 7 by a motor 8, which has a reversible drive, will .position the right-hand unit with respect to the left-hand unit. The spacing relationship between these two units is to accommodate different sizes of box blanks.

The box blank supporting 'table 9 comprises a left-hand member Hi and a right-hand member H, supported by brackets i2, which are in turn supported on the longitudinal side bars l3. These side bars l3 are of a sufiicient length to accommodate movement of the right-hand unit away from the left-hand unit when large size box blanks are being operated upon. The side bars l3 are in turn supported on adjustable table brackets 14 and !5 adapted to move in side vertical guides l6 and I! (see Fig. 2) by means of a hand-wheel hi, which, upon rotation, lowers or raises the screw it! which is journaled at 28 in the bracket l4, thereby imparting vertical movement to the side bars 13, and the blank supporting table. The supporting tables i3 and II attached to supporting bracket I 4 are provided with end guide rails 36 which engage the edges and cleat ends of sides and tops of the box blank-i9 to guide it into the machine and also to hold it from any side movement. The guide rail 36 are urged against the sides of' the box blank 39 by springs 31. Studs 38, which are fixed in the line guide rails 36 at spaced intervals, support the springs 3'! and provide a means for adjusting the guide rails 33 by means of the adjusting nuts 42.

The right-hand unit 2 comprisesa main housing or frame 2|, having suitable removable cover plates to permit access to the inside mechanism of the machine. The bottom portion of the housing 2| comprises an oil reservoir or sump 22 for the oil that is used in the operation of the hydraulic controls (see Fig. 3).

A motor housing 23 is attached to the rear wall of the housing 2!, thereby to provide a suitable semi-enclosure for an electric motor 24 adapted to operate an oil pump 25, which latter feeds oil to the hydraulic cylinders of one unit of the machine at a predetermined maximum operating pressure. The pump has an intake conduit 26 from the reservoir 22, the oil passing through the pump and through oil conduits to the hydraulic cylinders in the machine, as will hereinafter more fully appear.

A by-pass valve 21 is connected into the main oil line that comes from the discharge side of the pump and goes to thehydraulic mecha nism and is adjusted to automatically relieve an increase in pressure due to jamming of any part of the operating'mechanism, or any other condition that would tend to increase the oil pressure above a certain degree. The oil would then bypass through the valve 21 back into the reservoir 22 through the conduit 28, as indicated. The reservoir 22 is divided into two compartments by a partition 29, which permits the oil,

that is being discharged from the machine, to settle out the foreign particles before it flows over the partition 29 into the part of the reservoir where the intake pipe 26 for the pump is located.

On the base of the right-hand unit 2, there is formed a bracket 30 provided with the nut 8, which engages the motor-driven screw 1, whereby the unit 2 is positioned relatively to the unit I, as hereinbefore described. A roller 3|, supported-0n a block 33, which is attached to the nut 8, engages the upper surface of the base support 3, which forms a track for the roller 3|; the opposite end of thescrew I, being supported in the bracket 34, which together with the central support 33 formsa means for preventing sagging of the'screw 1, due to its great length.

Referring-to Fig, 46 of the drawings, there is shown a box blank 39 made up of four rectangular panels 40 and having spaced members 4|, as shown. The panels 40 are held together-by a series of transverse wires-43, which are attached to the box blank 39 by staples 44, in the well known manner. The wires 43 have ends 45 and 46 projecting from the edge of the box blank a sufficient distance to provide enough material to form a twistedlop. The amount of wire that projects is generally of greater length than will be necessary, and therefore it must be trimmed down to'the proper or desired length. This operation is accomplished by the trimming mechanism 41, comprising a set of cutters 48 and 49 (see Figs. 4, 11, 12 and 13), The lower cutting blade 48 is attached to a trimming block 50 by means of screws 5|, while the upper cutting blade 49 is attached to a twister shaft hereinafter more fully described. The'trimming block 50 is connected by means of a. pin 52 to the upper end of a piston 53 which is actuated in the hydraulic cylinder 54. A casting 55 provides a guideway for the trimming 'block 50 andis bolt- 21.5. a55fQ ed to the main housingjl as shown in Fig -fl, The casting 55 also provides a. support for; an

' al-igner bracket 6which is bolted thereto, as

shown in Fig. 6. A vertical wall 51 of. the bracket 56 provides a guideway for a secondary-bracket 58, which latter is guided on pins 59 fixed in the base of the aligner bracket 56and-which have threaded ends to receive adjustingnuts60, thereby providing an adjustable stop iorthe bracket 58, which is urged upward by the compression springs BI, in a manner that will bereadily understood. The bracket 58 has an overhangin portion 62 which, inconjunction with the vertical wall 51 of the bracket 56; and the wall se r a loop bar or anvil 84, forms a substantially fiat vertical surface. This surface forms a stop; or positioning means for the wire as 'the operator feeds the, wired box blankinto the machine If for any reason, when the wire box blank is being positioned in the machine, and the wireend becomes tangled or jammed, the resiliency of the bracket 58 willallow thewireto pass between the upper surface of this bracketand theiwall B3 of theloop bar 64 and thento be untangled and repositioned in the machine by the operator.

The bracket 51 is provided with hinge connections 85 for a pair of wire holding arms BG, the purpose of which latter is to straighten out. the ends of the wire by forcing them against the S111.- faces formed by the members 56, 58 and63; and also to hold the wire in a straightenedposition while it is beingtrimmed. The arms 65 are ac.- tuated by cam surfaces 61 formed in the trimmer block 50, and when in a retracted or down position, the arms 66 rest on a vertical wall of the trimmer guide casting 55, previously described.

A pair of spring-pressed plungers 68 are contained in a housing 69, which is attached to the bracket 56 by means of bolts I0. The .plungers have pro.-

jecting ends 1|, whichextend through the walls 51 and 58 to engage the arms 166 when they are in their upward position, as shown .inFig. 7. Upon retraction of the trimming block 50, the 'arms- 66 are positively urged to return to the position as shown in Fig. 6, which is due .to the force of the spring-pressed plungers 66 acting against them. The arms 66 will thenibez removed from this position when the; twister. and forming operation takes place. The upper cutting or trimming blade 49 has a projection 12 (see Fig; 11) 1 which is so formed to fit into a longitudinal notch "I3 formed in the twister shaft 14 and being fixed thereto by bolts 15. The loop bar or anvil 64a1so seats in a longitudinal notch on thetwister shaft 14, and is also held in position by the bolts 15.

. After the wireis sheared by the knives,lit is then bent to form a right angle bymeans of a forming block 16, which is fixed to theltrimmer block 50 by means of a. screw 11, as shown. The block I6 is provided with a forming groove. 18

which contacts the wire as the block 16 is raised to bend the free end around the loop bar or anvil 64 to form a right angle,as shown in Fig.-

"11 of the drawings. When this 'actionhas been completed, the main portion ofthe wire is held firmly betweenthe loop bar Bland the forming block 16. Asleeve 80, which carries a forming die 8 I, is controlled by hydraulic cylinders 82, and

183. as shown in Figs. 14 and.15 and is moved toward the upstanding end of the wire45 to form itl'around the end of the loop baror anvil 64, as shown in Fig. 12. The .formingdie isheld-in -position in thesleeve by means of spring-pressed pins 84. The forward end of the sleeve base.

cut-away portion to provide a clearanceior thetrimming blade 48andthe trimming block when they are in upward position. The rear ward end of the sleeve 80 is formed with a flanged portion 85 which engages a notch 81 formed in the piston 88. This construction provides a means for connecting the piston 88 to the sleeve 80. The forming die M has a notch or groove. on its front and under surface to engage. the wire to form it around the end of the loop bar or anvil 64, as shown in Fig; 12. The groove 89 also has its entering opening surfaces'tapered as ShOWIlgiI'l Figs. 12 and 13, which will center the wire in the groove before it is formed into a U shape. A cam plate-90 (see Fig. 30), which is fixedto a stationary portion of the housing,

forces'thefree end of: the wire 45 as it is being bent to assume a positiontofthe right of the portion of wire that is stapled to the box blank.

A fiangedcasting 9I forms a bearing support for thesleeve 80 and also serves to provide in its lower portion the hydraulic cylinder 83 to control the retraction of the sleeve 80, which will hereinafter be more fully described. Prior ,to the retraction of the forming sleeve 80 with the .fOrmingWdieBI, a set of wire grippers (see, Fig.

20) are lowered into a position to grip the main section of the wire 43, together with the free end of the wire 45, and hold them in this posie tion while they are-being twisted. The forming sleeve will then be retracted before the'twisting operation begins. The Wire gripper assembly is lowered by means of ahydraulic cylinder 92 (see Fig. 3) which is located in a housing .93 formed on the main housing 2|. 26) operating in thecylinder92 is provided with an extension 95-which projects upwardly to receivea collar of the arm 96 whichhas formed .onits opposite end a short sleeve portionto re- 1 ceive anadjustable link 9 having threaded en-- gagement .with adjustingand locking nuts 98.

The. lower end ofthe link 9 is connected to another link ,99, which in turn is. connected to a gripper control slide I00 adaptedto reciprocate inthe gripper slide guide I0l. A pairof outstanding projections I02, formed on the sides ojf the guide IOI, are supported bylpins I0 3,which forms a pivoted connection. for the guide IOI.

. The pins I03 are journaled on projections of the stripper bracket plate I04 which is attached to the bracket I05, which is in turn bolted to the cylindrical housing 93, previously mentioned.

Thegripper control slide l00fhas pivotallyiat tached to its upper surface by the pin I08 (see Fig. 20) a pair of gripper connector levers I01.

The other ends of these levers are pivotally connected to the arms I08 and l09 of gripping members H0 and III,- which in turn arepivotally connected to a gripper holding slide H2 by means of the pivot pin II3 shown in the drawings, The levers I0'Ifand the arms.I08 and I09 of the gripper member H0 and III are bifur cated at their extremities to provide suitable connections, as shown in the drawings. The lefthand gripping member H0 is comprised of two sections, while the right-hand gripper member :I II comprises just the one section, as showndn Fig. 22. Each gripping member has formed on its lower end, wire gatherin g fingers H4. The

left-hand member 0 has two fingers spaced apart to accommodate the'single finger of the right-hand member III when they interlock to gripthe wire in the slot II5 which is formed when the fingers move towards each other, as

shown in Fig. 24. The gripper slide guide I 0I hasattached to its frontsurface, by means of A piston 94 (seeFig,

bolts II 6, a pair of clamping plates II1, provided with projections I I8 on their lower end (see Fig. 23), These projections II8 form a limiting stop for the gripper holder slide H2 also adapted to slide in the gripper slide guide I and to co operate with the gripper control slide I00. The lower end of the gripper holder slide HZ, as seen in Fig. 23, has cut-away portions I 'to form abutments which engage the projection II8. The upper portion of the gripper 'hold'er slide H2 is provided with parallel bores I22 to receive a pair of compression springs I23 guided on rod H9 and journalled in the top portion of the gripper control slide I00, previously mentioned. A projection I24 is formed on the rear surface of the gripper holder slide I I2, which'engages a projection I25 formed on the front surface of the gripper control slide I00 (see Fig. 25). When the grippers are inactive, or when the fingers II4 are separated (see Fig-20), the compression springs I23 force the slide II2 downwardly until the projection I24 abuts the projection I25. When the gripping action is to take place, the slide I00, which is guided in the gripper slide guide IOI and carrying with it the complete gripper assembly, is lowered until the gripper fingers assume a position relative to the 'wire, as shown in dotted lines in Fig. 20. Further downward movement of the slide I00 will cause the abutments I 21 of the gripper holder slide I I2 to engage the stationary projections I I8 of the clamping plates II1, which will limit further movement of the gripper holder slide I I2 in downward direction. The gripper control slide I00 continues to move downwardly, causing relative movement between these two members, and compress the springs I23. The wire gripping fingers H4 have their bottom surfaces I26 beveled as shown in Fig. 25, in order to permit them to assume a position closer to the surface of the box blank and therefore be more positive inthe action of gathering up the wire. When the wire has been firmly gripped, the forming sleeve 80 and Itheiforming die are retracted to a position as s own in Fig. 14.. This rearwardmovement is produced by the hydraulic cylinder 83 moving 'thepiston 88.which engages the flange 85 of the sleeve 80, previously described. 7

.The twisting of the wire is accomplished by the rotation of the loop bar or anvil 64, 'around which the wire is firmly held. The loop bar or anvil, being attached to the twister shaft as hereinbefore described, rotates with the twister shaft 14 and makes two and one-quarter turns to produce the required number of twists in the vwire. Rotation of the twister shaft is accomplished by the action of a pair of hydraulic cylinders I28 and I29 mounted at right angles with respect to the twister shaft 14, as shown in Fig. 3 of the drawings. A bracket I30 provides a suitable support for the twister shaft bearing l3I, which has formed in its lower portion the hydraulic cylinder 82, as hereinbefore described. This bearing I3I is provided with threaded portions I32 and I33 to receive collars I34 and I35, respectively, which provide locking means for the bearing I3I after it is adjusted'to the correct position. The twister shaft 14 is held from longitudinal displacement by means of a flange I36 abutting the shoulder I31 on'the bearing I3I, previously mentioned. The opposite surface of the flange engages a ball-bearing raceway I38, which is held in position in the bearing housing I3I by threaded rings I39 and I40. Formed on the'endof the twister shaft, is a pinion-I41 tightly in place.

engaging a rack bar I42, which is actuated by the pistons I43 and I44 in the hydraulic cylinders I 28 and I29. A twister cylinder housing I45, supported by the bearing 'I3I, forms a support for the hydraulic cylinders I28 and I29, and also provides a mounting for apairof rollers I41, which support or back up the'said rack I42. A coverplate I48 is bolted to the housing I45, as showh inFig. 14, and provides a mounting' for a paii 'o'f ball-bearing rac'eways l 4fljwhic'h form a bearin'g'for the'reduced end'I'50 of the twister shaft 14. A pair of adjustablestopping screws I5I are provided on'opposite ends of each bydraulic-cylinder I28 and I29'to adjustablylimit the movement of the pistons I43 and I-44 in the hydraulic cylinders. During the twisting operation, the twisted portion of the wire. will tend to lessen in-length', due to the amount of material that-will be take'n up by the twisting, This condition would, therefore, tendto cause the wire grippers, which are gripping the wire, to move toward the loop bar 64, which-is being held from any longitudinalmovement. In order to-provide a flexible means, so that the wire gripper assembly will be able to approach'the-loop bar 64,

a compression spring I52 is interposed between the gripper bracket plate I04, and the. gripper slide guide -IOI. A bolt I53, fixed in the plate I04 and projecting through'the slotted apertures I54 and I55, provide a support forthe spring I52. A pair of nuts I56 provide adjustable means for limiting the rearward-movement of the gripper slide guide IOI, as shown in Fig. 25. Due to the pivoted support I03, the wire grippers will swing in an arcuate path, thereby to approach the loop bar 64 as the wires are being twisted. When the wire grippers are released from the wire, due to the upward movement of the -gripper assembly, the compression spring I52 will automatically restore the gripper assembly to initialposition,

asshown in Fig. 25.

Upon completion of the twisting operation, the loop bar or anvil 64 assumesthe position shown in Fig. 32, with the twisted loop of the wire held A stripper'bar I51, guided in the bracket I05 and the plate I 04, is actuated by a stripper cylinder I58, whichis located in a portion formed'on the main housing-2|. The piston I50 has an'extension I60, which'projects upwardly to receive a collar on the arm I6I. The

opposite end of this arm I6I is pivotally connected to alink |62,Whl0h in turnisconnected to the stripper bar I 51. by the cross pin I63.

- Movement of the piston 159 will therefore trans- "as shown in Figs. 33, 34 and 35. bar then returns to its retracted position by mit its motion to the stripper bar I51. Acutout portion I64 on the stripper bar I51 will enable it to straddle the loop bar or anvil 64 in its downward movement to disengage the wire from 'the 'bar by means of the under surfaceI65 pushing the wire loop free from the loop bar or anvil-64, The stripper means of the action *of the hydraulic cylinder 4 58. The elongated loop I66 of the wire thus formed and twisted will then have the end-I61 of the wire in a position underlying'the twisted portion of' the loop and in 'close'pro'ximity to the surface of the box-blank.

A wire guide member 'I 68 engages the wireends 

